cp's OEIS Frontend

A245402 Number of nonnegative integers with property that their base 7/6 expansion (see A024643) has n digits.

%I A245402 #12 Jul 22 2014 12:35:04
%S A245402 7,7,7,7,7,7,7,14,14,14,21,21,28,28,35,42,49,56,63,77,91,105,119,140,
%T A245402 161,189,224,259,301,350,413,483,560,651,763,889,1036,1211,1414,1645,
%U A245402 1925,2240,2618,3052,3563,4158,4851,5656,6601,7700,8981,10479,12229,14266
%N A245402 Number of nonnegative integers with property that their base 7/6 expansion (see A024643) has n digits.
%F A245402 a(n) = 7*A120178(n).
%e A245402 a(3) = 7 because 650, 651, 652, 653, 654, 655 and 656 are the base 7/6 expansions for the integers 14, 15, 16, 17, 18, 19 and 20 respectively and these are the only integers with 3 digits.
%o A245402 (Sage)
%o A245402 A=[1]
%o A245402 for i in [1..60]:
%o A245402     A.append(ceil(((7-6)/6)*sum(A)))
%o A245402 [7*x for x in A]
%Y A245402 Cf. A024643, A120178, A072493, A245356.
%K A245402 nonn,base
%O A245402 1,1
%A A245402 _Hailey R. Olafson_, Jul 21 2014